chiark / gitweb /
fix an uninit'd variable
[chiark-utils.git] / cprogs / xacpi-simple.c
index 96ba105..f2ba491 100644 (file)
 /*
+ * display outputs, per line:
+ *
+ *   Remaining:         | Empty:       | Degraded:
+ *     blue     |  black       |  dimgrey      discharging
+ *     green    |  black       |  dimgrey      charging
+ *     cyan     |  black       |  dimgrey      charged
+ *     grey     |  black       |  dimgrey      charging&discharching!
+ *     lightgrey |  black      |  dimgrey      none of the above
+ *     blue     |  red         |  dimgrey      discharging - low!
+ *     green    |  red         |  dimgrey      charging - low
+ *     cyan     |  red         |  dimgrey      charged - low [1]
+ *     grey     |  red         |  dimgrey      charging&discharching, low [1]
+ *       ...  darkgreen  ...                   no batteries present
+ *       ...  yellow  ...                      error
+ *
+ * [1] battery must be quite badly degraded
+ */
+/*
+ * Copyright (C) 2004 Ian Jackson <ian@davenant.greenend.org.uk>
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 3,
+ * or (at your option) any later version.
+ *
+ * This is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this file; if not, consult the Free Software
+ * Foundation's website at www.fsf.org, or the GNU Project website at
+ * www.gnu.org.
  */
 
 #include <stdio.h>
+#include <assert.h>
 #include <math.h>
 #include <stdlib.h>
+#include <string.h>
+#include <errno.h>
 #include <unistd.h>
+#include <ctype.h>
+#include <stdint.h>
+#include <limits.h>
+#include <inttypes.h>
+
+#include <sys/poll.h>
+#include <sys/types.h>
+#include <dirent.h>
 
 #include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xresource.h>
+
+#define TOP      60
+#define BOTTOM 3600
+
+#define TIMEOUT         5000 /* milliseconds */
+#define TIMEOUT_ONERROR 3333 /* milliseconds */
+
+static const char program_name[]= "xacpi-simple";
+static int debug, alarmlevel;
+
+/*---------- general utility stuff and declarations ----------*/
 
 static void fail(const char *m) {
   fprintf(stderr,"error: %s\n", m);
-  sleep(5);
   exit(-1);
 }
 static void badusage(void) { fail("bad usage"); }
 
-static Display *d;
-static Window w;
+typedef uint64_t value;
+#define VAL_NOTFOUND (~(value)0)
+
+typedef struct fileinfo fileinfo;
+typedef int parser(const fileinfo*);
+
+static parser parse_uevent;
+
+struct fileinfo {
+  const char *filename;
+  parser *parse;
+  const void *extra;
+};
+
+/*---------- structure of and results from /sys/class/power/... ----------*/
+/* variables this_... are the results from readbattery();
+ * if readbattery() succeeds the appropriate ones are all valid
+ * and not VAL_NOTFOUND
+ */
+
+typedef struct batinfo_field {
+  const char *label;
+  value *valuep;
+  const char *enumarray[10];
+} batinfo_field;
+
+#define BAT_QTYS(_, _ec, EC_, PC_)                             \
+  _(design_capacity##_ec,    BATTERY,  EC_##FULL_DESIGN )      \
+  _(last_full_capacity##_ec, BATTERY,  EC_##FULL        )      \
+  _(remaining_capacity##_ec, BATTERY,  EC_##NOW         )      \
+  _(present_rate##_ec,       BATTERY,  PC_##NOW         )
+ /* ENERGY [mWh]; POWER [mW]; CHARGE [uAh]; CURRENT [uA] */
+
+#define UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)                    \
+  _(present,                 BATTERY,  PRESENT /* bool */ )    \
+  _(online,                  MAINS,    ONLINE  /* bool */ )
+
+#define UEVENT_FUNKY_QUANTITY_FIELDS(_)                \
+  BAT_QTYS(_,_energy,ENERGY_,POWER_)           \
+  BAT_QTYS(_,_charge,CHARGE_,CURRENT_)
+
+#define UEVENT_OPTIONAL_QUANTITY_FIELDS(_)                     \
+  _(voltage,                 BATTERY,  VOLTAGE_NOW /* uV */ )
+
+#define UEVENT_ENUM_FIELDS(_)                                          \
+  _(state,   BATTERY,  STATUS,  "Discharging","Charging","Full","Unknown" ) \
+  _(type,    BOTH,     TYPE,    "Mains",       "Battery"              )
+
+#define CHGST_DISCHARGING 0 /* Reflects order in _(state,...) above     */
+#define CHGST_CHARGING    1 /* Also, much code assumes exactly          */
+#define CHGST_CHARGED     2 /* these three possible states.             */
+#define CHGST_UNKNOWN     3 /* these three possible states.             */
+#define CHGST_ERROR       8 /* Except that this one is an extra bit.    */
+
+#define TYPE_MAINS        0 /* Reflects order in _(type,...) above        */
+#define TYPE_BATTERY      1 /* Also, much code assumes exactly these two  */
+#define TYPE_BOTH       100 /* Except this is a magic invalid value.      */
+
+#define SEPARATE_QUANTITY_FIELDS(_)            \
+  /* See commit ec6f5f0be800bc5f2a27046833dba04e0c67ffac for
+     the code needed to use this */
+
+
+#define ALL_DIRECT_VARS(_)                     \
+  UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)          \
+  UEVENT_FUNKY_QUANTITY_FIELDS(_)              \
+  UEVENT_OPTIONAL_QUANTITY_FIELDS(_)           \
+  UEVENT_ENUM_FIELDS(_)                                \
+  SEPARATE_QUANTITY_FIELDS(_)
+
+#define ALL_VARS(_)                            \
+  ALL_DIRECT_VARS(_)                           \
+  BAT_QTYS(_,,,)
+
+#define ALL_NEEDED_FIELDS(_)                   \
+  UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)          \
+  UEVENT_ENUM_FIELDS(_)                                \
+  SEPARATE_QUANTITY_FIELDS(_)
+
+#define ALL_PLAIN_ACCUMULATE_FIELDS(_)         \
+  UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)          \
+  SEPARATE_QUANTITY_FIELDS(_)
+
+#define ALL_ACCUMULATE_FIELDS(_)               \
+  ALL_PLAIN_ACCUMULATE_FIELDS(_)               \
+  BAT_QTYS(_,,,)
+
+
+#define F_VAR(f,...) \
+static value this_##f;
+ALL_VARS(F_VAR)
+
+#define Q_FLD(f,t,l)        { "POWER_SUPPLY_" #l, &this_##f },
+#define E_FLD(f,t,l,vl...)  { "POWER_SUPPLY_" #l, &this_##f, { vl } },
+
+static const batinfo_field uevent_fields[]= {
+  UEVENT_ESSENTIAL_QUANTITY_FIELDS(Q_FLD)
+  UEVENT_FUNKY_QUANTITY_FIELDS(Q_FLD)
+  UEVENT_OPTIONAL_QUANTITY_FIELDS(Q_FLD)
+  UEVENT_ENUM_FIELDS(E_FLD)
+  { 0 }
+};
+
+#define S_FLD(f,t,fn,vl...)                                            \
+static const batinfo_field bif_##f = { 0, &this_##f, { vl } };
+  SEPARATE_QUANTITY_FIELDS(S_FLD)
+
+#define S_FILE(f,t,fn,vl...) { fn, parse_separate, &bif_##f },
+
+static const fileinfo files[]= {
+  { "uevent",  parse_uevent,  uevent_fields },
+  SEPARATE_QUANTITY_FIELDS(S_FILE)
+  { 0 }
+};
+
+/*---------- parsing of one thingx in /sys/class/power/... ----------*/
+
+/* variables private to the parser and its error handlers */
+static char batlinebuf[1000];
+static FILE *batfile;
+static const char *batdirname;
+static const char *batfilename;
+static const char *batlinevalue;
+
+static int batfailf(const char *why) {
+  if (batlinevalue) {
+    fprintf(stderr,"%s/%s: %s value `%s': %s\n",
+           batdirname,batfilename, batlinebuf,batlinevalue,why);
+  } else {
+    fprintf(stderr,"%s/%s: %s: `%s'\n",
+           batdirname,batfilename, why, batlinebuf);
+  }
+  return -1;
+}
+
+static int batfailc(const char *why) {
+  fprintf(stderr,"%s/%s: %s\n",
+         batdirname,batfilename, why);
+  return -1;
+}
+
+static int batfaile(const char *syscall, const char *target) {
+  fprintf(stderr,"%s: failed to %s %s: %s\n",
+         batdirname ? batdirname : "*", syscall, target, strerror(errno));
+  return -1;
+}
+
+static int chdir_base(void) {
+  int r;
+  
+  r= chdir("/sys/class/power_supply");
+  if (r) return batfaile("chdir","/sys/class/power_supply");
+
+  return 0;
+}
+
+static void tidybattery(void) {
+  if (batfile) { fclose(batfile); batfile=0; }
+}
+
+static int parse_value(const fileinfo *cfile, const batinfo_field *field) {
+  if (*field->valuep != VAL_NOTFOUND)
+    return batfailf("value specified multiple times");
+
+  if (!field->enumarray[0]) {
+
+    char *ep;
+    *field->valuep= strtoull(batlinevalue,&ep,10);
+    if (*ep)
+      batfailf("value number syntax incorrect");
+
+  } else {
+       
+    const char *const *enumsearch;
+    for (*field->valuep=0, enumsearch=field->enumarray;
+        *enumsearch && strcmp(*enumsearch,batlinevalue);
+        (*field->valuep)++, enumsearch++);
+    if (!*enumsearch)
+      batfailf("unknown enum value");
+
+  }
+  return 0;
+}
+
+static int parse_uevent(const fileinfo *cfile) {
+  char *equals= strchr(batlinebuf,'=');
+  if (!equals)
+    return batfailf("line without a equals");
+  *equals= 0;
+  batlinevalue = equals+1;
+
+  const batinfo_field *field;
+  for (field=cfile->extra; field->label; field++) {
+    if (!strcmp(field->label,batlinebuf))
+      goto found;
+  }
+  return 0;
+
+ found:
+  return parse_value(cfile, field);
+}
+
+static int readbattery(void) { /* 0=>ok, -1=>couldn't */
+  
+  const fileinfo *cfile;
+  char *sr;
+  int r, l;
+  
+  r= chdir_base();
+  if (r) return r;
+
+  r= chdir(batdirname);
+  if (r) return batfaile("chdir",batdirname);
+
+#define V_NOTFOUND(f,...) \
+  this_##f = VAL_NOTFOUND;
+ALL_VARS(V_NOTFOUND)
+
+  for (cfile=files;
+       (batfilename= cfile->filename);
+       cfile++) {
+    batfile= fopen(batfilename,"r");
+    if (!batfile) {
+      if (errno == ENOENT) continue;
+      return batfaile("open",batfilename);
+    }
+
+    for (;;) {
+      batlinevalue= 0;
+      
+      sr= fgets(batlinebuf,sizeof(batlinebuf),batfile);
+      if (ferror(batfile)) return batfaile("read",batfilename);
+      if (!sr && feof(batfile)) break;
+      l= strlen(batlinebuf);
+      assert(l>0);
+      if (batlinebuf[l-1] != '\n')
+       return batfailf("line too long");
+      batlinebuf[l-1]= 0;
+
+      if (cfile->parse(cfile))
+       return -1;
+    }
+
+    fclose(batfile);
+    batfile= 0;
+  }
+
+  if (debug) {
+    printf("%s:\n",batdirname);
+#define V_PRINT(f,...)                                 \
+    printf(" %-30s = %20"PRId64"\n", #f, (int64_t)this_##f);
+ALL_DIRECT_VARS(V_PRINT)
+  }
+
+  int needsfields_MAINS   = this_type == TYPE_MAINS;
+  int needsfields_BATTERY = this_type == TYPE_BATTERY;
+  int needsfields_BOTH    = 1;
+
+  int missing = 0;
+
+#define V_NEEDED(f,t,...)                              \
+  if (needsfields_##t && this_##f == VAL_NOTFOUND) {   \
+    fprintf(stderr,"%s: %s: not found\n",              \
+           batdirname, #f);                            \
+    missing++;                                         \
+  }
+ALL_NEEDED_FIELDS(V_NEEDED)
+
+  if (missing) return -1;
+
+  return 0;
+}   
+
+/*---------- data collection and analysis ----------*/
+
+/* These next three variables are the results of the charging state */
+static unsigned charging_mask; /* 1u<<CHGST_* | ... */
+static double nondegraded_norm, fill_norm, ratepersec_norm;
+static int alarmed;
+
+#define Q_VAR(f,t,...) \
+static double total_##f;
+  ALL_ACCUMULATE_FIELDS(Q_VAR)
+
+static void acquiredata(void) {
+  DIR *di = 0;
+  struct dirent *de;
+  int r;
+  
+  charging_mask= 0;
+  alarmed = 0;
+
+  if (debug) printf("\n");
+
+#define Q_ZERO(f,t,...) \
+  total_##f= 0;
+ALL_ACCUMULATE_FIELDS(Q_ZERO)
+
+  r = chdir_base();
+  if (r) goto bad;
+
+  di= opendir(".");  if (!di) { batfaile("opendir","battery"); goto bad; }
+  while ((de= readdir(di))) {
+    if (de->d_name[0]==0 || de->d_name[0]=='.') continue;
+
+    batdirname= de->d_name;
+    r= readbattery();
+    tidybattery();
+
+    if (r) {
+    bad:
+      charging_mask |= (1u << CHGST_ERROR);
+      break;
+    }
+
+    if (this_type == TYPE_BATTERY) {
+      if (!this_present)
+       continue;
+
+      charging_mask |= 1u << this_state;
+
+#define QTY_SUPPLIED(f,...)   this_##f != VAL_NOTFOUND &&
+#define QTY_USE_ENERGY(f,...) this_##f = this_##f##_energy;
+#define QTY_USE_CHARGE(f,...) this_##f = this_##f##_charge;
+
+      double funky_multiplier;
+      if (BAT_QTYS(QTY_SUPPLIED,_energy,,) 1) {
+       if (debug) printf(" using energy\n");
+       BAT_QTYS(QTY_USE_ENERGY,,,);
+       funky_multiplier = 1.0;
+      } else if (BAT_QTYS(QTY_SUPPLIED,_charge,,)
+                this_voltage != VAL_NOTFOUND) {
+       if (debug) printf(" using charge\n");
+       BAT_QTYS(QTY_USE_CHARGE,,,);
+       funky_multiplier = this_voltage * 1e-6;
+      } else {
+       batfailc("neither complete set of energy nor charge");
+       continue;
+      }
+      if (this_state == CHGST_DISCHARGING)
+       /* negate it */
+       total_present_rate -= 2.0 * this_present_rate * funky_multiplier;
+
+#define Q_ACCUMULATE_FUNKY(f,...)                      \
+      total_##f += this_##f * funky_multiplier;
+BAT_QTYS(Q_ACCUMULATE_FUNKY,,,)
+    }
+
+#define Q_ACCUMULATE_PLAIN(f,t,...)                    \
+    if (this_type == TYPE_##t)                 \
+      total_##f += this_##f;
+ALL_PLAIN_ACCUMULATE_FIELDS(Q_ACCUMULATE_PLAIN)
+
+      
+  }
+  if (di) closedir(di);
+
+  if (debug) {
+    printf("TOTAL:\n");
+    printf(" %-30s = %#20x\n", "mask", charging_mask);
+#define T_PRINT(f,...)                                 \
+    printf(" %-30s = %20.6f\n", #f, total_##f);
+BAT_QTYS(T_PRINT,,,)
+ALL_PLAIN_ACCUMULATE_FIELDS(T_PRINT)
+  }
+
+  if ((charging_mask & (1u<<CHGST_DISCHARGING)) &&
+      !total_online/*mains*/) {
+    double time_remaining =
+      -total_remaining_capacity * 3600.0 / total_present_rate;
+    if (debug) printf(" %-30s = %20.6f\n", "time remaining", time_remaining);
+    if (time_remaining < alarmlevel)
+      alarmed = 1;
+  }
+
+  if (total_design_capacity < 0.5)
+    total_design_capacity= 1.0;
+
+  if (total_last_full_capacity < total_remaining_capacity)
+    total_last_full_capacity= total_remaining_capacity;
+  if (total_design_capacity < total_last_full_capacity)
+    total_design_capacity= total_last_full_capacity;
+
+  nondegraded_norm= total_last_full_capacity / total_design_capacity;
+  fill_norm= total_remaining_capacity / total_design_capacity;
+  ratepersec_norm=  total_present_rate
+    / (3600.0 * total_design_capacity);
+}
+
+static void initacquire(void) {
+}  
+
+/*---------- argument parsing ----------*/
+
+#define COLOURS                                        \
+  C(blue,           discharging)               \
+  C(green,         charging)                   \
+  C(cyan,           charged)                   \
+  C(lightgrey,      notcharging)               \
+  C(grey,           confusing)                 \
+  C(black,          normal)                    \
+  C(red,            low)                       \
+  C(dimgrey,        degraded)                  \
+  C(darkgreen,      absent)                    \
+  C(yellow,         error)                     \
+  C(white,          equilibrium)               \
+  GC(remain)                                   \
+  GC(white)                                    \
+  GC(empty)
+
+static XrmDatabase xrm;
+static Display *disp;
+static int screen;
+
+static const char defaultresources[]=
+#define GC(g)
+#define C(c,u)                                 \
+  "*" #u "Color: " #c "\n"
+  COLOURS
+#undef GC
+#undef C
+  ;
+
+#define S(s) ((char*)(s))
+static const XrmOptionDescRec optiontable[]= {
+  { S("-debug"),        S("*debug"),        XrmoptionIsArg },
+  { S("-warningTime"),  S("*warningTime"),  XrmoptionSepArg },
+  { S("-display"),      S("*display"),      XrmoptionSepArg },
+  { S("-geometry"),     S("*geometry"),     XrmoptionSepArg },
+#define GC(g)
+#define C(c,u)                                                 \
+  { S("-" #u "Color"),  S("*" #u "Color"),  XrmoptionSepArg }, \
+  { S("-" #u "Colour"), S("*" #u "Color"),  XrmoptionSepArg },
+  COLOURS
+#undef GC
+#undef C
+};
+
+static const char *getresource(const char *want) {
+  char name_buf[256], class_buf[256];
+  XrmValue val;
+  char *rep_type_dummy;
+  int r;
+
+  assert(strlen(want) < 128);
+  sprintf(name_buf,"xacpi-simple.%s",want);
+  sprintf(class_buf,"Xacpi-Simple.%s",want);
+  
+  r= XrmGetResource(xrm, name_buf,class_buf, &rep_type_dummy, &val);
+  if (!r) return 0;
+  
+  return val.addr;
+}
+
+static void more_resources(const char *str, const char *why) {
+  XrmDatabase more;
+
+  if (!str) return;
+
+  more= XrmGetStringDatabase((char*)str);
+  if (!more) fail(why);
+  XrmCombineDatabase(more,&xrm,0);
+}
+
+static void parseargs(int argc, char **argv) {
+  Screen *screenscreen;
+  
+  XrmInitialize();
+
+  XrmParseCommand(&xrm, (XrmOptionDescRec*)optiontable,
+                 sizeof(optiontable)/sizeof(*optiontable),
+                 program_name, &argc, argv);
+
+  if (argc>1) badusage();
+
+  debug= !!getresource("debug");
+
+  const char *alarmlevel_string= getresource("alarmLevel");
+  alarmlevel = alarmlevel_string ? atoi(alarmlevel_string) : 300;
+
+  disp= XOpenDisplay(getresource("display"));
+  if (!disp) fail("could not open display");
+
+  screen= DefaultScreen(disp);
+
+  screenscreen= ScreenOfDisplay(disp,screen);
+  if (!screenscreen) fail("screenofdisplay");
+  more_resources(XScreenResourceString(screenscreen), "screen resources");
+  more_resources(XResourceManagerString(disp), "display resources");
+  more_resources(defaultresources, "default resources");
+} 
+
+/*---------- display ----------*/
+
+static Window win;
 static int width, height;
-static GC gc_green, gc_red, gc_yellow, gc_blue;
 static Colormap cmap;
-static int screen;
+static unsigned long lastbackground;
 
-#define TOP      60
-#define BOTTOM 3600
+typedef struct {
+  GC gc;
+  unsigned long lastfg;
+} Gcstate;
+
+#define C(c,u) static unsigned long pix_##u;
+#define GC(g) static Gcstate gc_##g;
+  COLOURS
+#undef C
+#undef GC
 
 static void refresh(void);
 
-static void geometry(void) {
-  int dummy;
-  Window dummyw;
+#define CHGMASK_CHG_DIS ((1u<<CHGST_CHARGING) | (1u<<CHGST_DISCHARGING))
+
+static void failr(const char *m, int r) {
+  fprintf(stderr,"error: %s (code %d)\n", m, r);
+  exit(-1);
+}
+
+static void setbackground(unsigned long newbg) {
+  int r;
   
-  XGetGeometry(d,w, &dummyw,&dummy,&dummy, &width,&height, &dummy,&dummy);
-  refresh();
+  if (newbg == lastbackground) return;
+  r= XSetWindowBackground(disp,win,newbg);
+  if (!r) fail("XSetWindowBackground");
+  lastbackground= newbg;
+}
+
+static void setforeground(Gcstate *g, unsigned long px) {
+  XGCValues gcv;
+  int r;
+  
+  if (g->lastfg == px) return;
+  
+  memset(&gcv,0,sizeof(gcv));
+  g->lastfg= gcv.foreground= px;
+  r= XChangeGC(disp,g->gc,GCForeground,&gcv);
+  if (!r) fail("XChangeGC");
+}
+
+static void show_solid(unsigned long px) {
+  setbackground(px);
+  XClearWindow(disp,win);
 }
 
-static void show(double fill_norm, double ratepersec_norm, int ac) {
+static void show(void) {
   double elap, then;
-  int i, leftmost_lit;
+  int i, leftmost_lit, leftmost_nondeg, beyond, first_beyond;
+
+  if (!charging_mask)
+    return show_solid(pix_absent);
+
+  if (charging_mask & (1u << CHGST_ERROR))
+    return show_solid(pix_error);
+
+  setbackground(pix_degraded);
+  XClearWindow(disp,win);
+  
+  setforeground(&gc_remain,
+               !(charging_mask & CHGMASK_CHG_DIS) ?
+               (~charging_mask & (1u << CHGST_CHARGED) ?
+                pix_notcharging : pix_charged) :
+               !(~charging_mask & CHGMASK_CHG_DIS) ? pix_confusing :
+               charging_mask & (1u<<CHGST_CHARGING)
+               ? pix_charging : pix_discharging);
+               
+  setforeground(&gc_empty, alarmed ? pix_low : pix_normal);
 
-  for (i=0; i<height; i++) {
+  for (i=0, first_beyond=1; i<height; i++) {
     elap= !i ? 0 :
       height==2 ? BOTTOM :
       TOP * exp( (double)i / (height-2) * log( (double)BOTTOM/TOP ) );
     
     then= fill_norm + ratepersec_norm * elap;
 
-    leftmost_lit= then <= 0 ? -1 :
-      then >= 1.0 ? width :
-      width * then;
-
-fprintf(stderr," width=%d height=%d i=%d elap=%f then=%f leftmost_lit=%d\n",
-       (unsigned long)w,
-       width,height,i,then,leftmost_lit);
-    if (leftmost_lit >= 0)
-      XDrawLine(d, w, ac ? gc_blue : gc_green, 0,i, leftmost_lit,i);
-    if (leftmost_lit < width)
-      XDrawLine(d, w, then >= 0 ? gc_red : gc_yellow,
-               leftmost_lit+1,i, width,i);
+    beyond=
+      ((charging_mask & (1u<<CHGST_DISCHARGING) && then <= 0.0) ||
+       (charging_mask & (1u<<CHGST_CHARGING) && then>=nondegraded_norm));
+
+    if (then <= 0.0) then= 0.0;
+    else if (then >= nondegraded_norm) then= nondegraded_norm;
+
+    leftmost_lit= width * then;
+    leftmost_nondeg= width * nondegraded_norm;
+
+    if (beyond && first_beyond) {
+      XDrawLine(disp, win, gc_white.gc, 0,i, leftmost_nondeg,i);
+      first_beyond= 0;
+    } else {
+      if (leftmost_lit < leftmost_nondeg)
+       XDrawLine(disp, win, gc_empty.gc,
+                 leftmost_lit,i, leftmost_nondeg,i);
+      if (leftmost_lit >= 0)
+       XDrawLine(disp, win, gc_remain.gc, 0,i, leftmost_lit,i);
+    }
   }
 }
 
-static void refresh(void) {
-  show(0.3, 0.5/3600, 1);
+static void initgc(Gcstate *gc_r) {
+  XGCValues gcv;
+
+  memset(&gcv,0,sizeof(gcv));
+  gcv.function= GXcopy;
+  gcv.line_width= 1;
+  gc_r->lastfg= gcv.foreground= pix_equilibrium;
+  gc_r->gc= XCreateGC(disp,win, GCFunction|GCLineWidth|GCForeground, &gcv);
 }
 
-static void colour(GC *gc_r, const char *name) {
+static void colour(unsigned long *pix_r, const char *whichcolour) {
   XColor xc;
+  const char *name;
   Status st;
-  XGCValues gcv;
+
+  name= getresource(whichcolour);
+  if (!name) fail("get colour resource");
   
-  st= XAllocNamedColor(d,cmap,name,&xc,&xc);
-  if (!st) fail("couldn't allocate colour");
+  st= XAllocNamedColor(disp,cmap,name,&xc,&xc);
+  if (!st) fail(name);
   
-  gcv.function= GXcopy;
-  gcv.line_width= 1;
-  gcv.foreground= xc.pixel;
-  *gc_r= XCreateGC(d,w, GCFunction|GCForeground|GCLineWidth, &gcv);
+  *pix_r= xc.pixel;
 }
 
-int main(int argc, const char *const *argv) {
-  const char *windowid_string;
-  char *ep;
-  XEvent ev;
+static void initgraphics(int argc, char **argv) {
+  int xwmgr, r;
+  const char *geom_string;
+  XSizeHints *normal_hints;
+  XWMHints *wm_hints;
+  XClassHint *class_hint;
+  int pos_x, pos_y, gravity;
+  char *program_name_silly;
   
-  d= XOpenDisplay(0); if (!d) fail("could not open display");
-
-  if (!argv[0] || argv[1])
-    badusage();
+  program_name_silly= (char*)program_name;
 
-  /*  if (!(windowid_string= getenv("WINDOWID")))
-    badusage();  w= strtoul(windowid_string,&ep,0);
-  if (*ep) badusage();
+  normal_hints= XAllocSizeHints();
+  wm_hints= XAllocWMHints();
+  class_hint= XAllocClassHint();
 
-*/
+  if (!normal_hints || !wm_hints || !class_hint)
+    fail("could not alloc hint(s)");
 
-  screen= DefaultScreen(d);
+  geom_string= getresource("geometry");
 
-  w= XCreateSimpleWindow(d,DefaultRootWindow(d),0,0,50,50,0,0,0);
+  xwmgr= XWMGeometry(disp,screen, geom_string,"128x32", 0,
+                normal_hints,
+                &pos_x, &pos_y,
+                &width, &height,
+                &gravity);
 
-  cmap= DefaultColormap(d,screen);
+  win= XCreateSimpleWindow(disp,DefaultRootWindow(disp),
+                          pos_x,pos_y,width,height,0,0,0);
+  cmap= DefaultColormap(disp,screen);
   
-  colour(&gc_green,  "green");
-  colour(&gc_red,    "darkred");
-  colour(&gc_yellow, "yellow");
-  colour(&gc_blue,   "blue");
+#define C(c,u) colour(&pix_##u, #u "Color");
+#define GC(g) initgc(&gc_##g);
+  COLOURS
+#undef C
+#undef GC
+
+  r= XSetWindowBackground(disp,win,pix_degraded);
+  if (!r) fail("init set background");
+  lastbackground= pix_degraded;
+
+  normal_hints->flags= PWinGravity;
+  normal_hints->win_gravity= gravity;
+  normal_hints->x= pos_x;
+  normal_hints->y= pos_y;
+  normal_hints->width= width;
+  normal_hints->height= height;
+  if ((xwmgr & XValue) || (xwmgr & YValue))
+    normal_hints->flags |= USPosition;
+
+  wm_hints->flags= InputHint;
+  wm_hints->input= False;
+
+  class_hint->res_name= program_name_silly;
+  class_hint->res_class= program_name_silly;
+
+  XmbSetWMProperties(disp,win, program_name,program_name,
+                    argv,argc, normal_hints, wm_hints, class_hint);
+
+  XSelectInput(disp,win, ExposureMask|StructureNotifyMask);
+  XMapWindow(disp,win);
+}
+static void refresh(void) {
+  acquiredata();
+  show();
+}
 
-  XSelectInput(d,w, ExposureMask|VisibilityChangeMask);
-  XMapWindow(d,w);
+static void newgeometry(void) {
+  int dummy;
+  Window dummyw;
   
-  geometry();
+  XGetGeometry(disp,win, &dummyw,&dummy,&dummy, &width,&height, &dummy,&dummy);
+}
+
+static void eventloop(void) {
+  XEvent ev;
+  struct pollfd pfd;
+  int r, timeout;
   
+  newgeometry();
+  refresh();
+
   for (;;) {
-    XNextEvent(d,&ev);
-    geometry();
+    XFlush(disp);
+
+    pfd.fd= ConnectionNumber(disp);
+    pfd.events= POLLIN|POLLERR;
+
+    timeout= !(charging_mask & (1u << CHGST_ERROR)) ? TIMEOUT : TIMEOUT_ONERROR;
+    r= poll(&pfd,1,timeout);
+    if (r==-1 && errno!=EINTR) failr("poll",errno);
+
+    while (XPending(disp)) {
+      XNextEvent(disp,&ev);
+      if (ev.type == ConfigureNotify) {
+       XConfigureEvent *ce= (void*)&ev;
+       width= ce->width;
+       height= ce->height;
+      }
+    }
+    refresh();
   }
 }
+
+int main(int argc, char **argv) {
+  parseargs(argc,argv);
+  initacquire();
+  initgraphics(argc,argv);
+  eventloop();
+  return 0;
+}